<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title>input-placeholder</title>
</head>

<body>
    <!-- placeholder属性为输入框设置占位符，值为占位符的内容-->
    <input type="Text" placeholder="请输入用户名">
    <input type="password" placeholder="请输入密码">
</body>

</html>